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Comprehensive evaluation should focus on source rock, reservoir, overpressure, and fracture for geological "sweet area," on buried depth, rock compressibility, and stress anisotropy for engineering "sweet area," and on resources scale, buried depth and surface conditions for economic "sweet area".
a Tight oil "sweet area" distribution of the Fuyu oil layer, Songliao Basin; b tight oil "sweet area" distribution of Chang 71 Member in the Ordos Basin.
Areas with grade I and II source rocks and reservoirs are tight oil "sweet area".
At present, priority should be given to favorable source rock, reservoir, overpressure, fracture, and local structure of geological "sweet area," and pressure coefficient, brittleness, crustal stress, and buried depth of engineering "sweet area" (Table 2).
The evaluation of the distribution of tight oil "sweet area" should focus on relationships between "six features".
According to the evaluation criteria of tight oil source rocks and reservoirs (Table 3), tight oil "sweet area" in China were evaluated.
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Based on the exploration and research progress of liquid-rich hydrocarbons in shale at home and abroad, their formation condition, accumulation mechanism, classification, and differences between lacustrine and marine shale systems are examined, and "sweet areas" are evaluated further.
It is concluded that the geological conditions of the lacustrine shales in China are characterized by lower thermal gradient and stronger heterogeneity than those of North America, so large scale "sweet areas" have to be picked out to push up industrial production steadily.
Mr. Miserocchi said: "When the happy couple moved in to their five-acre estate in Sagaponack, which they affectionately called the Swamp, they dug up all the animals in her cemetery and reburied them there in a sweet little area with a wrought-iron gate".
"Sweet spot area" assessment, "factory-like" operation pattern and other core evaluation methods and technologies are discussed.
And 8 key elements of unconventional "sweet spot area" are proposed, 3 of them are TOC>2% (for shale oil S1>2 mg/g), higher porosity (for tight oil & gas >10%, shale oil & gas >3%), and microfractures.
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